Coherent light of wavelength 680 nm falls on two very small slits and produces an interference pattern on a screen 2.6 m away. On this screen, the third-order bright fringe is 38 mm from the central bright fringe. What is the slit separation? Sketch the situation, defining all variables.  Please sketch the situation, this is most important.

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Interference of Light

The word "constructive" signifies addition in interference. Constructive interference occurs when the path of the waves that start from the slit differs by 1 entire wavelength or in the intervals of the same. Hence, the waves that are presented on the screen are in phase (crest to crest/trough to trough). The waves interfering constructively forms bright fringes on the screen.